It holds two caves with interesting but fragile calcareous formations, and has been listed as a protected area since 1978.

The Gruta do Lago Azul has a main hall with a floor that slopes to a subterranean lake over 50 metres (160 ft) long.

Between the months of September and February the waters take on an intense blue color, for which the lake is named.

Fossil bones have been found of large mammals that inhabited the region for more than 12,000 years in the Pleistocene.

[2] The Gruta de Nossa Senhora Aparecida is closed to visitors for safety reasons.